Regex to parse function names?

This is a discussion on Regex to parse function names? within the C++ Programming forums, part of the General Programming Boards category; This isn't exactly C++ related, with the exception of I'm dealing with C++ function names. I'm trying to write a ...

  1. #1
    Registered User
    Join Date
    Nov 2008
    Posts
    119

    Regex to parse function names?

    This isn't exactly C++ related, with the exception of I'm dealing with C++ function names. I'm trying to write a regex that can parse the function names of C++ functions but I only want standalone function names. So the text is also pretty much identicle to a var name except it will end with a (. I can come kind of close and this is what I have so far

    Code:
    (?![a-z])[^\:,>,\.]([a-z,A-Z]+[_][a-z,A-Z]+)+[(]
    To give a better idea of what I'm trying to match, this should match

    asdfas_asdfasd_asdfasf(
    [asdfas_asdfasd_asdfasf(
    (asdfas_asdfasd_asdfasf(

    This shouldn't match

    asf_as_df::asdfas_asdfasd_asdfasf(
    asf_as_df.asdfas_asdfasd_asdfasf(
    asf_as_df->asdfas_asdfasd_asdfasf(

    Are there any regex gurus out there that can help me out with this?

  2. #2
    The larch
    Join Date
    May 2006
    Posts
    3,573
    I don't think it is that simple.

    Code:
    struct A
    {
       A(int);
    };
    
    A a(10); //this is not a function
    
    A b(int(0)); //this is not a function
    
    int n;
    
    A c(int(n)); //this is a function
    
    A d((int(n))); //this is not a function
    
    A e(n); //this is not a function
    
    etc
    The language is context sensitive. In order to tell whether a pattern is or isn't a function name, you actually have to know if the tokens involved in the expressions are typenames or not.

    Apart from not being able to tell whether it is a function declaration (call) or an instance declaration, you'll probably also not be able to spot cases where operator() is involved and probably some other cases.
    Last edited by anon; 03-30-2011 at 02:03 PM.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  3. #3
    Registered User
    Join Date
    Nov 2008
    Posts
    119
    Well that quickly pointed out some outliers I missed. I now have

    Code:
    (?![a-z])[^\:,>,\.]([a-z,A-Z]+[_]*[a-z,A-Z]*)+[(]
    While what I have listed as being matches may not guarentee it to be a function, it is a high probability that it is. I'll be pruning the results manually after. I'm just trying to get a good candidate list.

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